Hi Donna,
I disagree with you. From a pure safety standpoint, children
need to be instructed on how to use scissors. In my art room we
use good fiskars and durasharp scissors. These are the
children's version of these scissors but they are very sharp
nonetheless. To avoid injury, I do quite a bit of instruction.
I also do not have Ks do scissor activities until a few weeks
into the school year, so that they have had some experiences in
their classroom (with duller scissors). From another viewpoint,
many children these days (at least in my rural area) do not have
many materials at home to work with. If no one ever shows them
how to use these tools, they may or may not learn to use them
correctly.

Just my .02!

As for coloring in the lines, that is a more naturally occuring
skill, I think! Most students hit a period where they want
everything to be inside the lines. That comes at a different
time for each kid.